Document Type
Article
Department/Program
Mathematics
Journal Title
OPERATORS AND MATRICES
Pub Date
Fall 11-4-2016
Volume
10
Issue
4
Abstract
Let K-1, K-2 be two compact convex sets in C. Their Minkowski product is the set K1K2 = {ab : a is an element of K-1, b is an element of K-2}. We show that the set K1K2 is star-haped if K-1 is a line segment or a circular disk. Examples for K-1 and K-2 are given so that K-1 and K-2 are triangles (including interior) and K1K2 is not star-shaped. This gives a negative answer to a conjecture by Puchala et. al concerning the product numerical range in the study of quantum information science. Additional results and open problems are presented.
Recommended Citation
Li, Chi-Kwong; Pelejo, Diane Christine; Poon, Yiu-Tung; and Wang, Kuo-Zhong, MINKOWSKI PRODUCT OF CONVEX SETS AND PRODUCT NUMERICAL RANGE (2016). OPERATORS AND MATRICES, 10(4).
10.7153/oam-10-53
DOI
10.7153/oam-10-53
